Re: linux-next: build failure after merge of the tip tree

From: Len Brown
Date: Sun Jan 19 2014 - 23:45:51 EST

+static void mwait_idle(void)
+ mwait_idle_with_hints(0, 0);

The reason the patch above will crash Core2 machines is because
core2 machines don't support mwait_idle_with_hints().

The calling sequence for old and new MWAIT instructions is different.
The former must be invoked with interrupts enabled,
and the later can be invoked with interrupts disabled,
which is a feature that Linux takes advantage of.

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